Unfair labour practices at Mr Price Southgate

I went to the Mr Price at Southgate on 12/12/2019 where they had a pregnant lady standing there in the queue and scanning our items if we were paying by card. My understanding is that she is not allowed to sit down whilst working. This country has labour laws for a reason. We can't be supporting companies who have no empathy towards their staff and who do not have fair labour practices.Standing the whole time on a 10 hour shift is abuse.Give the lady a chair!!!